vert \vert\, n. f., green, from l. viridis. see verdant, and
   cf. verd.
   1. eng. forest law
      a everything that grows, and bears a green leaf, within
          the forest; as, to preserve vert and venison is the
          duty of the verderer.
      b the right or privilege of cutting growing wood.
          1913 webster

   2. her. the color green, represented in a drawing or
      engraving by parallel lines sloping downward toward the
      right.
      1913 webster
see also:
verdant verd 

vert. everything bearing green leaves in a forest. bac. ab. courts of the 
foreat; manwood, 146.